A kind of production method of potassium nitrate

A production method and technology of potassium nitrate, applied in the direction of alkali metal nitrate preparation, alkali metal nitrate purification, magnesium halide, etc., can solve the problems of high investment cost, large energy consumption, complex equipment structure, etc., and achieve low cost and high energy efficiency. The effect of low consumption and high product purity

Active Publication Date: 2020-06-30
长沙鑫本助剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the product quality has been improved by this method, the energy consumption is large, the equipment structure is complex and the investment cost is high.

Method used

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  • A kind of production method of potassium nitrate

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Experimental program
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Effect test

Embodiment 1

[0051] Add 1,260 grams of 50% nitric acid into a 2000 ml four-necked flask equipped with a stirrer, condenser and thermometer, slowly add 195 grams of magnesium oxide powder under stirring, control the PH value between 2 and 7, and complete the oxidation. Magnesium continues to stir for 30 minutes, then slowly add 745 grams of solid potassium chloride, and then heat it with steam to dissolve it. Control the temperature at 60℃~110℃ to dissolve the solid potassium chloride, and then keep it at 100℃~110℃ for 1 hour. Distill part of the water; then filter while hot to remove the incompatible impurities in the material liquid; then transfer the filtrate to a 5000 ml flask with stirring, thermometer and cooling bath to cool and crystallize. When the temperature of the material liquid drops to 30°C, add Add 400 grams of methanol to the solution, continue to stir and crystallize, stir and crystallize at 20°C for 1 hour to make the potassium nitrate precipitate completely; then the solid...

Embodiment 2

[0053] Add 1,260 grams of 50% nitric acid into a 2000 ml four-necked flask equipped with a stirrer, condenser and thermometer, slowly add 195 grams of magnesium oxide powder under stirring, control the PH value between 2 and 7, and complete the oxidation. Magnesium continues to stir for 30 minutes, then slowly add 745 grams of solid potassium chloride, and then heat it with steam to dissolve it. Control the temperature at 60℃~110℃ to dissolve the solid potassium chloride, and then keep it at 100℃~110℃ for 1 hour. Distill part of the water; then filter while hot to remove the incompatible impurities in the material liquid; then transfer the filtrate to a 5000 ml flask with stirring, thermometer and cooling bath to cool and crystallize. When the temperature of the material liquid drops to 30°C, add Add 600 grams of methanol to the solution, continue to stir and crystallize. When the temperature drops to -10℃, stir and crystallize for 1 hour to make the potassium nitrate precipitat...

Embodiment 3

[0055] Add 1,260 grams of 50% nitric acid into a 2000 ml four-necked flask with stirring, condenser and thermometer, slowly add 195 grams of magnesium oxide powder under stirring, control the PH value between 2-7, and complete the oxidation. Magnesium continues to stir for 30 minutes, then slowly add 745 grams of solid potassium chloride, then heat it with steam to dissolve it, control the temperature at 60℃-110℃ to dissolve the solid potassium chloride, and then keep it at 100℃-110℃ for 1 hour. Distill part of the water; then filter while it is hot to remove the incompatible impurities in the material liquid; then transfer the filtrate to a 5000 ml flask equipped with stirring, thermometer and cooling bath to cool and crystallize. When the temperature of the material liquid drops to 20℃, Add 1000 grams of methanol to the solution, continue to stir and crystallize. When the temperature drops to -10°C, stir and crystallize for 1 hour to make the potassium nitrate precipitate comp...

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Abstract

The invention discloses a potassium nitrate production method, comprising the following steps: Step (1): magnesium oxide, potassium chloride and nitric acid react; Step (2): a reaction solution obtained in the Step (1) undergoes solid-liquid separation to obtain a filtrate; Step (3): a cosolvent is mixed into the filtrate obtained in the Step (2); Step (4): a crystallization feed liquid obtained in the Step (3) undergoes solid-liquid separation so as to obtain potassium nitrate. The method has the following advantages: the raw materials are easily available; the cost is low; the technology isgreen and environmentally-friendly; and the cosolvent can be repeatedly recovered for indiscriminate application. In comparison with a traditional double decomposition technology, the production method of the invention has the following beneficial effects: product purity is higher; yield is higher; the application range of the by-product magnesium chloride is wider; and the risk brought from the use of ammonium nitrate to production and inconveniences of raw material transportation are also avoided.

Description

Technical field [0001] The invention relates to the technical field of inorganic chemical engineering, in particular to a method for producing high-purity potassium nitrate Background technique [0002] Potassium Nitrate (KNO 3 ) Also known as saltpeter and soil nitrate, it is an important inorganic chemical product and a high-quality compound fertilizer of chlorine-free nitrogen and potassium. As an agricultural potash fertilizer, potassium nitrate is much better than potassium chloride. It has the effect of significantly improving crop quality and increasing production and income. Potassium nitrate for non-fertilizer purposes is a raw material for making black gunpowder and is also used in flames to produce purple sparks. The pharmaceutical industry can be used to produce penicillin potassium salt and rifampin. Edible potassium nitrate is used as a coloring agent and antiseptic additive in the food industry. It can also be used as a glass fining agent and in the manufacture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D9/08C01D9/16C01F5/30
CPCC01D9/08C01D9/16C01F5/30
Inventor 刘建李刚
Owner 长沙鑫本助剂有限公司
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